Air-filter.



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AIR FILTER.

APPLICATION FILED MAR. 30, 1910.

Patented May 9, 1911.

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AIR FILTER.

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991,572. 1 Patented May 9,1911.

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construction of a cold air filter comprising UNITED STATES PATENT OFFICE.

SIMON P. WEISENSTEIN, 0F SHARPSBURG, PENNSYLVANIA.

AIR-FILTER.

Specification of Letters Patent.

Patented May 9, 1911.

Application filed March 30, 1910. Serial No. 552,418.

To all whom it may concern:

Be it known that I, SIMON P. Versus STEIN, citizen of the United States, residing at Sharpsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improve-' ments in Air-Filters, of which the following is a specification.

This invention relates to improvements in cold and hot air filters for hot air heating systems and relates to the construction of an improved device whereby the air flowing through the externally or internally located cold air intake or hot air discharge pipe may be filtered thus keeping dust from the interior of the building or house heated by the hot air heating plant. I One of the objects of the invention is the construction of an improved cold air filter adapted to be removably mounted on the cold air intake or hot air discharge pipe and provided with removable spaced screens whereby dust mixed with. the infiowing air will be trapped between the screens.

Another object of the invention is the a drum having reduced ends adapted to recelve the end of. an a1r intake pipe and a series of screens positioned between the ends whereby dust flowing with the air will be' trapped.

\Vith the above and'other objects in view the invention comprises certain combina-- tions, constructions and arrangements of parts, clearly described in the following specification and clearly shown in the accompanying drawings forming a part of the specification, in which,

Figure 1 is a side elevation of the improved air filter, with its door partly open,

Fig. 2 is a front end view thereof, Fig. 3'

is a longitudinal sectional view of the filter .with the'door thereof closed, and Fig. 4 is a detail sectional View of a screen holding member.

Referring to the accompanying drawings illustrating the invention 1 denotes the shell of the drum of the filter and 2 the door therefor. The door 2 is adapted to close the opening 3 of the drum 1. The door 2 is made considerably larger than the opening 3 so that there will be no leakage of the air and dust flowing through the drum 1, the edges of the door forming an effective seal for the drum opening. A member at is hinged to the door-2 and is adapted to engage a latch keeper 5, whereby the door may be locked to the drum.

The drum 1 is provided with circumferental grooves 6 and the door 2 is also provided with like grooves adapted to register with the grooves of the drum. Three of these grooves are provided, two near the ends of the drum and one at thecenter thereof. Against the end edges of the drum 1 the annular end walls 7 and 8 are fitted, and on these end walls the pipes or connections 9 and 10 are mounted. The pipes or connections 9 and 10 are made considerably smaller than the drum 1 and are about the size of the intake pipe which they are adapted to be connected to.

In the groove 6 nearest the end wall. 7

a wire screen 10 is positioned, which is adapted to trap the coarser dirt and dust flowing through the drum. In the grooves 6 near the end wall 8 cloth screens 11 are positioned. The screens 11 are of different mesh so that different finenesses of dust may be trapped by the different screens. Each screen is held in place by a holding member which comprises an inner ring 12 and an outer ring 13. The inner ring 12 is connected to the outer ring 13 by the hinge 14 which has an end 15 bent against In hot air heating systems the cold air intake pipe is usually located outside of the building and the infiowing' air supply carries with it a large amount of dust and dirt which permeates the interior of the house or building heated. 'By means of the improved air filter this inflowing dust is trapped at the mouth of the intake pipe. The hinged door permits of the ready removal of all dust and dirt accumulated in the drum and the renewal of the screens when they become useless for the purpose intended.

Having described my invention I claim 1. An air filter consisting of a drum, screen frames disposed at intervals Within said drum said frame consistin of pairs of hinged hoops, a screening abric carried by said frames, and means for securing said frames within said drum.

2. An air filter consisting of a drum haw ing reduced inlets andoutlets, a series of circumferential grooves on said drum, a series of double hoops, adapted to form stretchers for screens, the outer of said hoops having circumferential beads thereon and adapted to rest in the grooves on said drum, :1 door having grooves thereon adapted to engage the heads of said hoop and lock said hoops 111 ahorlzontal position on said drums.

3. In an airfilter for hotair heating sysof equal diameter to the intake pipe of a heating system, a series of hinged screen holding members having flanges adapted to register with the grooves of the drum and a door hinged to the drum adapted to close the opening thereof,

In testimony whereof I aiiix my signature in presence of two witnesses.

SIMON P. \VEISENSTEIN. Vitnesses P. H. KEEFE. THEo. KREMER. 

